Fuel tank structure

Abstract

A fuel tank structure comprising a fuel tank; a canister that adsorbs evaporated fuel within the fuel tank, and that releases vapor after adsorption of evaporated fuel; a full tank regulating valve within the fuel tank that becomes a closed state due to a float floating in fuel when a fuel liquid surface reaches a full tank liquid level that is set in advance; a communication pipe that communicates the fuel tank and the canister via the full tank regulating valve, a cross-sectional area varying valve that, when tank internal pressure that is applied from inside of the fuel tank increases, reduces a cross-sectional area of a flow path of vapor that flows toward the float; and a suppressing member that is positioned between the cross-sectional area varying valve and the float, and that suppresses airflow from the cross-sectional area varying valve from directly abutting the float.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority under 35 USC 119 from Japanese Patent Application No. 2013-030393 filed Feb. 19, 2013, the disclosure of which is incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The present invention relates to a fuel tank structure.[0004]2. Related Art[0005]Japanese Patent Application Laid-Open (JP-A) No. 2011-246031 discloses, as a fuel tank structure, a structure that is provided with a second valve mechanism beneath a float, and is provided with a fuel cut-off valve in which, when airflow that is headed toward the fuel cut-off valve is received from the fuel tank interior, a closing body reduces the opening surface area of an introduction port.[0006]In the structure of JP-A No. 2011-246031, a connection hole is provided at the closing body in order to ensure ventilation even in the state in which the valve is closed. However, when a flow path to a canister that adsorbs evapora...

AI Technical Summary

Benefits of technology

The present invention provides a fuel tank structure that prevents air from a high pressure fuel tank from affecting the regulation valve and keeps it closed. The structure includes a suppressing member between the cross-sectional area varying valve and the float, which prevents the air from hitting the float directly and causing it to close. The barrier portion prevents the vapor from directly hitting the float. This results in the suppression of vapor and ensures a steady regulation of fuel tank pressure.

Problems solved by technology

However, when a flow path to a canister that adsorbs evaporated fuel within the fuel tank is opened, or the like, there are cases in which the vapor that has passed through this connection hole acts on the float.

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